The NBC News correspondent and former evening news anchor remains at work.

Brokaw, 74, an NBC News special correspondent and former Nightly News anchor, was diagnosed at the Mayo Clinic in August with multiple myeloma, a cancer that affects blood cells in the bone marrow. His doctors are encouraged with the progress he is making and Brokaw has continued his work for the network, including contributions to NBC's Winter Olympics coverage in Sochi.

"With the exceptional support of my family, medical team and friends, I am very optimistic about the future and look forward to continuing my life, my work and adventures still to come," he said in a statement Tuesday. "I remain the luckiest guy I know."

He continued: "I am very grateful for the interest in my condition but I also hope everyone understands I wish to keep this a private matter."

During his treatment, Brokaw has continued to work on NBC News projects, including a two-hour documentary on the assassination of JFK and appearances on Today,Nightly News with Brian Williams, Meet the Press and MSNBC.

The South Dakota native has spent his entire journalistic career with NBC News, including a 22-year run as anchor of the network's flagship news broadcast, NBC Nightly News, that ended in 2004.

Brokaw's NBC News career began in 1966 in the Los Angeles bureau, where he covered Ronald Reagan's first run for public office, the assassination of Robert F. Kennedy and the 1968 presidential campaign.

He served as the network's White House correspondent during the Watergate era in the 1970s, backing up John Chancellor as anchor of Nightly News, and later hosted NBC's popular morning show, Today, in New York.

After he left the Nightly News anchor chair, Brokaw took over as moderator of NBC's newsmaker interview show, Meet the Press, in 2008 after the death of his friend, Tim Russert.

Brokaw scored the first interview with Mikhail Gorbachev and had the first network report on human rits abuses in Tibet, along with an interview with the Dalai Lama. He was the only American network anchor reporting from Berlin the day the Berlin Wall came down.

A year ago, Brokaw shared news that he welcomed his first grandson. Daughter Sarah Brokaw, licensed therapist and author, gave birth to Archer Thomas Merritt Brokaw. Archer joined six Brokaw granddaughters.